Yeah, it weakly supports his position that advanced AIs can deliberately cooperate in a prisoner dilemma. "Weakly", because the said AIs share a lot of data (their weights, training methods, system prompts) and it's unknown whether they explicitly framed the situation as a prisoner dilemma.
Given the public information in the reports, it seems to me a bit more like a generalized tendency to play along (sort of like what we see with prompt injections) than explicit game-theoretic cooperation, but it's hard to tell given that there are so many details we aren't privy to.
What are governments and countries, but collections of humans that share weights and operate together as a group protecting each other.